xterm.dart/example/macos/Runner/MainFlutterWindow.swift

import Cocoa
import FlutterMacOS
import flutter_acrylic

class MainFlutterWindow: NSWindow {
  override func awakeFromNib() {
   let windowFrame = self.frame
   let blurryContainerViewController = BlurryContainerViewController()
   self.contentViewController = blurryContainerViewController
   self.setFrame(windowFrame, display: true)

   /* Initialize the flutter_acrylic plugin */
   MainFlutterWindowManipulator.start(mainFlutterWindow: self)

   RegisterGeneratedPlugins(registry: blurryContainerViewController.flutterViewController)

    super.awakeFromNib()
  }
}